Display panel and display apparatus

Abstract

Embodiments of the present disclosure provide a display panel and a display apparatus. The display panel comprises a plurality of sub-pixels arranged in an array, and comprises a base substrate, a light-emitting device layer, an optical adjustment layer and an anti-reflection layer. The light-emitting device layer is provided on one side of the base substrate and comprises a plurality of light-emitting regions configured to emit different colors; the plurality of light-emitting regions respectively correspond to the plurality of sub-pixels and comprise a first light-emitting region and a second light-emitting region; the first light-emitting region is configured to emit light located in a first waveband and having a first color; and the second light-emitting region is configured to emit light located in a second waveband and having a second color. The optical adjustment layer is provided on a light exit side of the light-emitting device layer, and is configured such that the transmittance for the light in the first waveband is less than the transmittance for the light in the second waveband, and the reflectivity for the light in the first waveband is greater than the reflectivity for the light in the second waveband. The anti-reflection layer is provided on the side of the optical adjustment layer distant from the light-emitting device layer.

Description

Display panel and display device Technical Field

[0001] Embodiments of the present disclosure relate to a display panel and a display device. Background Art

[0002] Organic light emitting diode (OLED) display panels are widely used in the display field due to their advantages such as self-luminescence, wide viewing angle, and fast response speed. OLED display panels generally include a light-emitting device having a light-emitting layer for emitting light of different colors (for example, red, green, and blue). Generally speaking, in existing light-emitting devices, red and green light-emitting materials generally use phosphorescent materials, while blue light usually uses fluorescent materials due to lifespan issues. However, due to the difference in the luminescence mechanisms of phosphorescent and fluorescent materials themselves, the fluorescent luminous efficiency is much lower than the phosphorescent luminous efficiency, which in turn causes the light extraction efficiency and luminous brightness of the blue light-emitting area in the display panel to be much lower than the light extraction efficiency and luminous brightness of red and green light. Therefore, improving the light extraction efficiency of blue light is an important research topic in existing OLED display technology.

[0003] In order to improve the light extraction efficiency in the blue light region, most current technical solutions aim to optimize the light-emitting system of blue light materials to achieve the performance of red and green light devices. However, most of the current new blue light emission mechanisms cannot achieve both efficiency and lifespan, and cannot meet mass production requirements. Therefore, in order to ensure the display lifespan of blue light, existing display technologies generally increase the display area of ​​blue sub-pixels and reduce current density to ensure the effective lifespan of blue light, but this will also lead to a decrease in pixel density and reduce the fineness of the displayed image. In addition, since there is a process upper limit on the spacing between display units, this will also lead to an increase in process difficulty, which in turn leads to a decrease in yield.

[0004] Summary of the Invention

[0005] At least one embodiment of the present disclosure provides a display panel, comprising a plurality of sub-pixels arranged in an array, and including: a base substrate; a light-emitting device layer disposed on one side of the base substrate, wherein the light-emitting device layer includes a plurality of light-emitting areas configured to emit different colors, the plurality of light-emitting areas corresponding to the plurality of sub-pixels respectively, and including a first light-emitting area and a second light-emitting area, the first light-emitting area configured to emit light within a first wavelength band and having a first color, and the second light-emitting area configured to emit light within a second wavelength band and having a second color; an optical adjustment layer disposed on a light-emitting side of the light-emitting device layer, the optical adjustment layer configured to have a transmittance for light in the first wavelength band lower than a transmittance for light in the second wavelength band, and a reflectance for light in the first wavelength band higher than a reflectance for light in the second wavelength band, wherein the optical adjustment layer covers at least the first light-emitting area, and an orthographic projection of the first light-emitting area on the base substrate is located within the orthographic projection of the optical adjustment layer on the base substrate; and an anti-reflection layer disposed on a side of the optical adjustment layer away from the light-emitting device layer.

[0006] In the display panel provided by at least one embodiment of the present disclosure, the wavelength of the first wavelength band is smaller than the wavelength of the second wavelength band.

[0007] In the display panel provided by at least one embodiment of the present disclosure, the transmittance of the optical adjustment layer to light in the first wavelength band ranges from 30% to 70%, and the reflectivity of the optical adjustment layer to light in the first wavelength band ranges from 30% to 70%.

[0008] In the display panel provided in at least one embodiment of the present disclosure, the multiple light-emitting areas also include a third light-emitting area, the third light-emitting area is configured to emit light within a third wavelength band and having a third color, and the optical adjustment layer is configured to have a transmittance for light in the third wavelength band greater than a transmittance for light in the first wavelength band, and a reflectivity for light in the third wavelength band less than a reflectivity for light in the first wavelength band.

[0009] In the display panel provided by at least one embodiment of the present disclosure, the optical adjustment layer has a transmittance greater than 80% and a reflectivity less than 15% for at least part of the light in the second wavelength band and the light in the third wavelength band.

[0010] In the display panel provided in at least one embodiment of the present disclosure, the first band is 440nm to 500nm, one of the second band and the third band is 500nm to 580nm, the other of the second band and the third band is 580nm to 650nm, and the first color is blue, one of the second color and the third color is green, and the other of the second color and the third color is red.

[0011] In the display panel provided by at least one embodiment of the present disclosure, the multiple sub-pixels include red sub-pixels, green sub-pixels and blue sub-pixels, and the first light-emitting area, the second light-emitting area and the third light-emitting area are the light-emitting areas of the blue sub-pixel, the green sub-pixel and the red sub-pixel, respectively; and the aperture ratio of the blue sub-pixel is greater than or equal to the aperture ratio of the red sub-pixel, the aperture ratio of the green sub-pixel is greater than or equal to the aperture ratio of the red sub-pixel, the aperture ratio of the red sub-pixel is less than or equal to 8%, and the largest aperture ratio of the blue sub-pixel and the green sub-pixel is less than or equal to 10%.

[0012] In the display panel provided by at least one embodiment of the present disclosure, the optical adjustment layer is configured such that a color deviation value CIEx or CIEy of the incident light emitted from the plurality of light-emitting areas after passing through the optical adjustment layer and the incident light is less than or equal to 0.005.

[0013] In the display panel provided by at least one embodiment of the present disclosure, the first light-emitting area, the second light-emitting area, and the third light-emitting area are light-emitting areas of a blue sub-pixel, a green sub-pixel, and a red sub-pixel, respectively, and the optical adjustment layer is configured such that a color deviation value CIEx or CIEy of first incident light emitted from the first light-emitting area after passing through the optical adjustment layer relative to the first incident light is less than or equal to 0.001; a color deviation value CIEx or CIEy of second incident light emitted from the second light-emitting area after passing through the optical adjustment layer relative to the second incident light is less than or equal to 0.002; and a color deviation value CIEx or CIEy of third incident light emitted from the third light-emitting area after passing through the optical adjustment layer relative to the third incident light is less than or equal to 0.003.

[0014] In the display panel provided in at least one embodiment of the present disclosure, the optical adjustment layer is a continuous film layer, and the orthographic projections of the second light-emitting area and the third light-emitting area on the base substrate are also located within the orthographic projection of the optical adjustment layer on the base substrate.

[0015] In the display panel provided by at least one embodiment of the present disclosure, the orthographic projections of the first light-emitting area, the second light-emitting area, and the third light-emitting area on the base substrate are located within the orthographic projection of the anti-reflection layer on the base substrate.

[0016] In the display panel provided by at least one embodiment of the present disclosure, the optical adjustment layer is configured to transmit a first portion of the light emitted from the first light-emitting area and reflect a second portion of the light, and the anti-reflection layer is configured to transmit the first portion of the light.

[0017] In the display panel provided in at least one embodiment of the present disclosure, the optical adjustment layer is further configured to reflect the second portion of light toward at least one film layer located between the optical adjustment layer and the base substrate, and the second portion of light is further reflected by the at least one film layer and emitted as a first sub-light toward the optical adjustment layer; the optical adjustment layer is configured to transmit at least a portion of the first sub-light; and the anti-reflection layer is configured to transmit at least a portion of the first sub-light.

[0018] In the display panel provided by at least one embodiment of the present disclosure, the light-emitting device layer includes a reflective electrode, and the at least one film layer reflecting the second portion of light includes the reflective electrode.

[0019] In the display panel provided by at least one embodiment of the present disclosure, the first portion of light has a first polarization state, the second portion of light has a second polarization state, and the polarization state of the second portion of light changes after being reflected by the at least one film layer, so that the first sub-light has the first polarization state.

[0020] In the display panel provided by at least one embodiment of the present disclosure, the anti-reflection layer includes at least a polarization conversion layer and a polarizing layer, the polarizing layer is located on a side of the polarization conversion layer away from the optical adjustment layer, and the polarization direction of light with the first polarization state after passing through the polarization conversion layer is parallel to the polarization direction of the polarizing layer.

[0021] The display panel provided in at least one embodiment of the present disclosure further includes a light absorbing layer, and the light absorbing layer is located on a side of the polarizing layer away from the polarization conversion layer.

[0022] In the display panel provided by at least one embodiment of the present disclosure, the orthographic projection of the optical adjustment layer on the base substrate is located within the orthographic projection range of the anti-reflection layer on the base substrate.

[0023] The display panel provided in at least one embodiment of the present disclosure further includes: a spacer layer, defining a plurality of sub-pixel openings, the plurality of light-emitting areas being respectively located in the corresponding sub-pixel openings; and a light-shielding layer, located between the spacer layer and the optical adjustment layer in a direction perpendicular to the main surface of the base substrate, the light-shielding layer having a plurality of light-transmitting openings, the plurality of sub-pixel openings corresponding to the plurality of light-transmitting openings one-to-one, and the orthographic projection of each sub-pixel opening on the base substrate being located within the orthographic projection range of the corresponding light-transmitting opening on the base substrate.

[0024] In the display panel provided by at least one embodiment of the present disclosure, the spacing layer and the light-shielding layer respectively have a first sub-pixel opening and a first light-transmitting opening corresponding to the first light-emitting area, and a second sub-pixel opening and a second light-transmitting opening corresponding to the second light-emitting area; the spacing layer has a first spacing edge defining the first sub-pixel opening and a second spacing edge defining the second sub-pixel opening, and the light-shielding layer has a first light-shielding edge defining the first light-transmitting opening and a second light-shielding edge defining the second light-transmitting opening; and the first spacing edge and the first light-shielding edge have a first offset distance in a direction parallel to the main surface of the substrate, and the second spacing edge and the second light-shielding edge have a second offset distance in a direction parallel to the main surface of the substrate.

[0025] In the display panel provided by at least one embodiment of the present disclosure, the first offset distance is different from the second offset distance.

[0026] In the display panel provided by at least one embodiment of the present disclosure, the first offset distance is greater than the second offset distance.

[0027] In the display panel provided by at least one embodiment of the present disclosure, the first offset distance and the second offset distance are less than or equal to 4 micrometers.

[0028] In the display panel provided by at least one embodiment of the present disclosure, the first outgoing light and the second outgoing light emitted from the first light-emitting area and the second light-emitting area and passing through the optical adjustment layer and the anti-reflection layer respectively have a first brightness attenuation value and a second brightness attenuation value at a viewing angle different from 0 degrees, and the first brightness attenuation value and the second brightness attenuation value are respectively the percentage of the difference between the brightness of the first outgoing light and the second outgoing light at a viewing angle different from 0 degrees and the initial brightness at a viewing angle of 0 degrees as a percentage of the initial brightness; and at the same viewing angle, the first brightness attenuation value is greater than the second brightness attenuation value.

[0029] In the display panel provided in at least one embodiment of the present disclosure, at a viewing angle of 30 degrees, the first brightness attenuation value ranges from 32% to 40%, and the second brightness attenuation value ranges from 17% to 28%; at a viewing angle of 45 degrees, the first brightness attenuation value ranges from 62% to 70%, and the second brightness attenuation value ranges from 55% to 57.5%.

[0030] In the display panel provided by at least one embodiment of the present disclosure, at the same viewing angle, a difference between the first brightness attenuation value and the second brightness attenuation value is less than 7.5%.

[0031] In the display panel provided by at least one embodiment of the present disclosure, the spacer layer includes a light-absorbing material, the absorbance of the spacer layer is not less than 0.5 / μm, and the slope angle of the spacer layer is less than or equal to 35 degrees.

[0032] In the display panel provided by at least one embodiment of the present disclosure, the light shielding layer includes a light absorbing material, and the absorbance of the light shielding layer is not less than 0.5 / μm.

[0033] In the display panel provided by at least one embodiment of the present disclosure, the spacer layer does not include a light absorbing material.

[0034] In the display panel provided by at least one embodiment of the present disclosure, the spacer layer includes a light-absorbing material, and the light-absorbing material of the spacer layer is the same as the light-absorbing material of the light-shielding layer.

[0035] In the display panel provided by at least one embodiment of the present disclosure, the slope angle of the light shielding layer is greater than or equal to the slope angle of the spacer layer.

[0036] In the display panel provided by at least one embodiment of the present disclosure, the light-emitting device layer includes a first light-emitting layer and a second light-emitting layer, the first light-emitting layer and the second light-emitting layer respectively include at least portions located in the first light-emitting area and the second light-emitting area, and the thickness of the first light-emitting layer in a direction perpendicular to the main surface of the base substrate ranges from 15 nm to 25 nm; the thickness of the second light-emitting layer in a direction perpendicular to the main surface of the base substrate ranges from 25 nm to 40 nm.

[0037] The display panel provided in at least one embodiment of the present disclosure further includes an encapsulation layer located on a side of the light-emitting device layer close to the optical adjustment layer. The encapsulation layer has a multi-layer structure, and the refractive index of at least two layers thereof is greater than or equal to 1.65.

[0038] In the display panel provided by at least one embodiment of the present disclosure, the encapsulation layer includes at least an inorganic structure layer and an organic structure layer, and the coverage area of ​​the inorganic structure layer is greater than or equal to the coverage area of ​​the organic structure layer.

[0039] The display panel provided in at least one embodiment of the present disclosure further includes a light extraction layer located between the light-emitting device layer and the encapsulation layer, and the refractive index difference between the light extraction layer and the refractive index of the material layer in the encapsulation layer that contacts the light extraction layer is greater than 0.1.

[0040] At least one embodiment of the present disclosure provides a display device, comprising any one of the display panels described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0042] FIG. 1 illustrates a schematic cross-sectional view of a display substrate according to some embodiments of the present disclosure.

[0043] Figure 2A schematically shows a light path diagram of light emitted from a light-emitting area in a display panel in some embodiments of the present disclosure; Figure 2B schematically shows a light emission principle diagram of light emitted from a light-emitting area in a display panel in some embodiments of the present disclosure.

[0044] FIG3 illustrates a schematic cross-sectional view of a display substrate according to some embodiments of the present disclosure.

[0045] FIG4 is a plan view schematically illustrating an arrangement of sub-pixels in a pixel unit of a display panel according to some embodiments of the present disclosure.

[0046] FIG5A is a graph showing the transmittance of the optical adjustment layer in a display panel for light of various wavelengths according to some embodiments of the present disclosure; FIG5B is a graph showing the reflectance of the optical adjustment layer in a display panel for light of various wavelengths according to some embodiments of the present disclosure.

[0047] FIG6 schematically shows a reflectivity curve diagram of the entire display panel according to some embodiments of the present disclosure.

[0048] 7A to 7C schematically illustrate viewing angle brightness attenuation L-Decay curves of a display panel at various viewing angles according to some embodiments of the present disclosure.

[0049] FIG8 schematically shows a graph showing how the device performance of a display panel according to some embodiments of the present disclosure changes with the transmittance of an optical adjustment layer.

[0050] FIG9 illustrates a schematic cross-sectional view of a display panel according to some embodiments of the present disclosure.

[0051] 10A to 10C are schematic cross-sectional views showing more specific structures of a partial region in FIG. 9 in other embodiments. DETAILED DESCRIPTION

[0052] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0053] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0054] An embodiment of the present disclosure provides a display panel comprising a plurality of sub-pixels arranged in an array, and comprising a substrate, a light-emitting device layer, an optical adjustment layer, and an anti-reflection layer. The light-emitting device layer is disposed on one side of the substrate and comprises a plurality of light-emitting regions configured to emit different colors, the plurality of light-emitting regions corresponding to the plurality of sub-pixels, and comprising a first light-emitting region and a second light-emitting region, the first light-emitting region configured to emit light of a first color within a first wavelength band, and the second light-emitting region configured to emit light of a second color within a second wavelength band; the optical adjustment layer is disposed on a light-emitting side of the light-emitting device layer and is configured to have a lower transmittance for light in the first wavelength band than for light in the second wavelength band, and a higher reflectance for light in the first wavelength band than for light in the second wavelength band, wherein the optical adjustment layer covers at least the first light-emitting region, and an orthographic projection of the first light-emitting region on the substrate is located within an orthographic projection of the optical adjustment layer on the substrate; and the anti-reflection layer is disposed on a side of the optical adjustment layer away from the light-emitting device layer.

[0055] In the embodiments of the present disclosure, by providing an optical adjustment layer and an anti-reflection layer, and by setting the transmittance and reflectivity of the optical adjustment layer to have the aforementioned characteristics, the optical adjustment layer can improve the light extraction efficiency of the first light-emitting zone, thereby enhancing the luminous brightness of the display panel corresponding to the first light-emitting zone. Simultaneously, the provision of the optical adjustment layer has substantially no or minimal effect on the light extraction efficiency and luminous brightness of the second light-emitting zone. In some embodiments, the first light-emitting zone is, for example, a blue light zone, and the second light-emitting zone is, for example, a green light zone or a red light zone. That is, in some embodiments, the provision of the optical adjustment layer and the anti-reflection layer can increase the light extraction efficiency and luminous brightness of the blue light zone of the display panel. Furthermore, since the light extraction efficiency and luminous brightness of the other light-emitting zones, such as the red and green light zones, are already relatively good, the light extraction efficiency and luminous brightness of these zones are substantially unaffected by the optical adjustment layer. This results in the light extraction efficiency and luminous brightness of the blue light, red light, and green light zones being similar to each other, reducing the luminous brightness difference between the blue light and the red and green light zones, thereby improving the display quality of the display panel.

[0056] On the other hand, because the provision of an optical adjustment layer and an anti-reflection layer can enhance the light extraction efficiency and luminous brightness of blue light, even when the luminous area of ​​the blue sub-pixel is relatively small, the current density of the blue sub-pixel can be adjusted to a lower level, thereby ensuring the lifespan of the blue light. That is, both the lifespan and luminous brightness of the blue light can be simultaneously ensured to be unaffected. Therefore, in some embodiments, by providing an optical adjustment layer and an anti-reflection layer, the aperture ratio of the blue sub-pixel can be optimized while ensuring the lifespan and luminous brightness of the blue light, thereby optimizing the overall aperture ratio of the display panel pixels. The area of ​​a single sub-pixel (e.g., a blue sub-pixel) can be reduced, increasing the number of pixels per unit area, thereby achieving a high display pixel density (PPI). Furthermore, the power consumption of the display panel can also be reduced. Furthermore, the spacing between different luminous areas can be set within an appropriate range, reducing process difficulty and improving the yield of the display panel.

[0057] FIG. 1 illustrates a schematic cross-sectional view of a display substrate according to some embodiments of the present disclosure.

[0058] Referring to Figure 1, in some embodiments, a display substrate 50 includes a plurality of sub-pixels arranged in an array and includes a base substrate 10, a light-emitting device layer LE, an optical adjustment layer 20, and an anti-reflection layer 22. The light-emitting device layer LE is located on one side of the base substrate 10 and includes multiple light-emitting regions; each of the multiple light-emitting regions corresponds to a plurality of sub-pixels. The optical adjustment layer 20 and the anti-reflection layer 22 are disposed on the light-emitting side of the light-emitting device layer LE, with the optical adjustment layer 20 located between the light-emitting device layer LE and the anti-reflection layer 22. The multiple light-emitting regions are configured to emit light of different colors. For example, the multiple light-emitting regions include light-emitting regions R1, R2, and R3. Light-emitting region R1 can also be referred to as the first light-emitting region, while light-emitting regions R2 and R3 can be referred to as the second and third light-emitting regions, respectively, or vice versa. The following description uses light-emitting region R2 as the second light-emitting region and light-emitting region R3 as the third light-emitting region as an example. In some embodiments, the first light-emitting region R1 is configured to emit light within a first band and having a first color, the second light-emitting region R2 is configured to emit light within a second band and having a second color, and the third light-emitting region R3 is configured to emit light within a third band and having a third color.

[0059] In some embodiments, the wavelength of the first wavelength band is shorter than the wavelengths of the second wavelength band and the third wavelength band. In some embodiments, the first wavelength band is a blue wavelength band, one of the second wavelength band and the third wavelength band is a green wavelength band, and the other of the second wavelength band and the third wavelength band is a red wavelength band. For example, the light emitted by luminescent region R1 is blue, and the blue wavelength range is approximately 440nm to 500nm; the light emitted by luminescent region R2 is green, and the green wavelength range is approximately 500nm to 580nm; and the light emitted by luminescent region R3 is red, and the red wavelength range is approximately 580nm to 650nm. For example, luminescent regions R1, R2, and R3 are the luminescent regions of the corresponding blue sub-pixel, green sub-pixel, and red sub-pixel, respectively.

[0060] In some embodiments, the optical adjustment layer 20 is disposed on the light-emitting side of the light-emitting device layer LE. The optical adjustment layer 20 is configured to have a lower transmittance for light in a first wavelength band (e.g., the blue wavelength band) than for light in a second wavelength band (e.g., the green wavelength band) and a third wavelength band (e.g., the red wavelength band), and a higher reflectivity for light in the first wavelength band than for light in the second and third wavelength bands. For example, the transmittance of the optical adjustment layer 20 for light in the first wavelength band ranges from approximately 30% to 70%, and the reflectivity for light in the first wavelength band ranges from approximately 30% to 70%. In some examples, the transmittance and reflectivity of the optical adjustment layer 20 for light in the first wavelength band are both 50%, meaning that the optical adjustment layer 20 may be semi-transmissive and semi-reflective with respect to light in the first wavelength band. For example, the transmittance of the optical adjustment layer 20 for at least a portion of light in the second and third wavelength bands is greater than 80%, and the reflectivity is less than 15%.

[0061] In some embodiments, the optical adjustment layer 20 has a transmittance greater than 80% and a reflectance less than 15% over at least half of the visible light band (380-780 nm). This at least half of the band may include at least portions of the red and green bands, and exclude the blue band. The optical adjustment layer 20 may have a transmittance and reflectance ranging from 30% to 70% over at least a specific wavelength range where the difference between the maximum and minimum wavelengths is 30±20 nm. This specific wavelength range covers at least a portion of the blue light band, for example, completely or partially overlapping with the blue light band.

[0062] In some embodiments, the optical adjustment layer 20 covers at least the light-emitting region R1 and may further cover the light-emitting regions R2 and R3. In other words, the orthographic projection of the light-emitting region R1 on the substrate 10 is within the orthographic projection of the optical adjustment layer 20 on the substrate 10. The orthographic projections of the light-emitting regions R2 and R3 on the substrate may or may not overlap with the orthographic projection of the optical adjustment layer 20 on the substrate 10 (e.g., partially or completely). In some embodiments, the optical adjustment layer 20 is a continuous film layer that extends continuously on the light-emitting side of the light-emitting regions R1 to R3, and the orthographic projections of the light-emitting regions R1, R2, and R3 on the substrate 10 are all within the orthographic projection of the optical adjustment layer 20 on the substrate 10. Herein, the orthographic projection of a component on the substrate 10 refers to the projection of the component on the substrate 10 in a direction perpendicular to the main surface of the substrate 10.

[0063] In some embodiments, the anti-reflection layer 22 is disposed on a side of the optical adjustment layer 20 away from the light-emitting device layer LE, that is, on the light-emitting side of the optical adjustment layer 20. The anti-reflection layer 22 covers multiple light-emitting regions. For example, the orthographic projections of the light-emitting regions R1-R3 on the base substrate 10 are all within the orthographic projection of the anti-reflection layer 22 on the base substrate 10. In some embodiments, the anti-reflection layer 22 is configured to prevent or reduce the occurrence of ambient light incident on the display panel being reflected by the film layers in the display panel before being emitted from the display panel, thereby reducing the panel reflectivity and improving the contrast of the display panel. In some embodiments, the anti-reflection layer 22 can transmit at least a portion of the light from the multiple light-emitting regions. For example, the transmittance of the anti-reflection layer 22 for light in the 460nm to 630nm wavelength range is greater than or equal to 40%, for example, 50%. In other words, in some embodiments, the anti-reflection layer 22 also has a certain blocking effect on the light emitted by the light-emitting regions R1-R3.

[0064] In some embodiments, the coverage area of ​​the optical adjustment layer 20 is no larger than that of the anti-reflection layer 22; for example, the orthographic projection of the optical adjustment layer 20 on the base substrate 10 is within the orthographic projection of the anti-reflection layer 22 on the base substrate 10. In some embodiments, by providing the optical adjustment layer 20 and the anti-reflection layer 22, the light extraction efficiency and luminous brightness of the light-emitting region R1 (e.g., the blue light region) can be increased without substantially affecting the light emission of the light-emitting regions R2 and R3.

[0065] Figure 2A schematically shows a light path diagram of light emitted from the light emitting region R1. Figure 2B schematically shows a light emission principle diagram of light emitted from the light emitting region R1.

[0066] For example, referring to Figures 1 and 2A, in some embodiments, the optical adjustment layer 20 is configured to transmit a first portion of light A1 of the light A emitted from the light-emitting region R1 and reflect a second portion of light A2 of the light A, and the anti-reflection layer 22 is configured to transmit the first portion of light A1. For example, after transmitting through the optical adjustment layer 20, at least a majority (e.g., all) of the first portion of light A1 may transmit through the anti-reflection layer 22, thereby exiting from the light-exiting surface of the display panel. In some embodiments, the second portion of light A2 reflected by the optical adjustment layer 20 is incident on at least one film layer located between the optical adjustment layer 20 and the base substrate 10, and is further reflected by the at least one film layer and emitted back toward the optical adjustment layer 20 as first sub-light A2'. At least a portion (e.g., all) of the first sub-light A2' transmits through the optical adjustment layer 20 and may further transmit through the anti-reflection layer 22, thereby exiting from the light-exiting surface of the display panel. For example, after reflection, the second portion of light A2 may transmit through both the optical adjustment layer 20 and the anti-reflection layer 22. Since the optical adjustment layer 20 reflects the second portion of light A2 , and the second portion of light A2 is reflected by the at least one film layer and then emitted through the optical adjustment layer 20 and the anti-reflection layer 22 , the light extraction efficiency and luminous brightness of the light emitting region R1 are improved.

[0067] 2A and 2B , in some embodiments, the anti-reflection layer 22 includes a polarization conversion layer 22a and a polarizing layer 22b. The polarization conversion layer 22a and the polarizing layer 22b are sequentially arranged in the light-emitting direction of the optical adjustment layer 20. For example, the polarization conversion layer 22a is disposed on a side of the optical adjustment layer 20 away from the light-emitting region, and the polarizing layer 22b is disposed on a light-emitting side of the polarization conversion layer 22a, for example, on a side of the polarization conversion layer 22a away from the optical adjustment layer 20.

[0068] For example, the polarization conversion layer 22a can be a phase retardation film having an integral multiple of 1 / 4λ and non-positive wavelength dispersion. The polarization conversion layer 22a can convert circularly polarized light into linearly polarized light, or vice versa. The polarizing layer 22b is configured to have a polarization direction d2 and transmit light parallel to its polarization direction. In some embodiments, the polarizing layer 22b is configured to have a transmittance of not less than 40% within the 460 to 630 nm wavelength band, for example, approximately 50%.

[0069] FIG2B schematically illustrates the light emission principle of light emitted from the light-emitting region R1 after passing through the optical adjustment layer 20 and the polarization conversion layer 22a and polarizing layer 22b of the anti-reflection layer 22. To clearly illustrate the state of the light after passing through each layer, the optical adjustment layer 20, the polarization conversion layer 22a, and the polarizing layer 22b are shown as separate layers in the figure. However, it should be understood that adjacent two layers among these layers may be adjacent to each other or may be in contact with each other.

[0070] Referring to FIG. 2B , in some embodiments, a first portion A1 of light A emitted from light-emitting region R1 has a first polarization state, and a second portion A2 has a second polarization state. The optical adjustment layer 20 is configured to transmit light with the first polarization state and reflect light with the second polarization state. Furthermore, the polarization direction of the light with the first polarization state, after passing through the polarization conversion layer 22 a of the anti-reflection layer 22 , is parallel to the polarization direction of the polarizing layer 22 b , allowing the light with the first polarization state to pass through the anti-reflection layer 22 .

[0071] For example, the first polarization state and the second polarization state can be circular polarization states of different directions (e.g., opposite directions). For example, the first portion of light A1 is left-handed circularly polarized light, and the second portion of light is right-handed circularly polarized light, or vice versa. Light with the first polarization state (e.g., left-handed circularly polarized light) passes through the optical adjustment layer 20 and then passes through the polarization conversion layer 22a and is converted by the polarization conversion layer 22a into linearly polarized light. The polarization direction of the linearly polarized light is parallel to the polarization direction of the polarizing layer 22b, and thus can be emitted through the polarizing layer 22b.

[0072] In some embodiments, light with a second polarization state (e.g., right-handed circularly polarized light) is reflected by the optical adjustment layer 20 to at least one film layer (e.g., a reflective electrode of a light-emitting device layer, etc.) located between the optical adjustment layer 20 and the base substrate 10, and the light with the second polarization state can be at least partially further reflected by the at least one film layer and emitted toward the optical adjustment layer 20 again. In some embodiments, after being reflected by the at least one film layer, the polarization state of the light with the second polarization state (e.g., right-handed circularly polarized light) changes (e.g., reverses) and is converted into light with a first polarization state (e.g., left-handed circularly polarized light), and thus can pass through the optical adjustment layer 20 and the anti-reflection layer 22 including the polarization conversion layer 22a and the polarizing layer 22b.

[0073] That is, for light A1 emitted from light-emitting region R1, the optical adjustment layer 20 transmits the first portion of light A1 (e.g., left-handed circularly polarized light) in the light A and reflects the second portion of light A2 (e.g., right-handed circularly polarized light). The first portion of light A1 then passes through the polarization conversion layer 22a and is converted into light a1. Light a1 is, for example, linearly polarized light having a polarization direction d1. The polarization direction d1 of the linearly polarized light a1 is parallel to the polarization direction d2 of the polarizing layer 22b, allowing the linearly polarized light a1 to be emitted through the polarizer 22b. The second portion of light A2 (for example, right-handed circularly polarized light) reflected by the optical adjustment layer 20 is incident on at least one film layer located between the optical adjustment layer 20 and the base substrate, and is further reflected by the at least one film layer and emitted back toward the optical adjustment layer 20 as first sub-light A2′. The at least one film layer may, for example, include a reflective electrode in the light-emitting device layer. After being reflected by the at least one film layer, the second portion of light A2 changes its polarization state, for example, from right-handed circularly polarized light to left-handed circularly polarized light. That is, the first sub-light A2′ is left-handed circularly polarized light, and thus can pass through the optical adjustment layer 20. The first sub-light A2′ then passes through the polarization conversion layer 22a and is converted into light a2′. Light a2′ is, for example, linearly polarized light having a polarization direction d1. The polarization direction d1 of the linearly polarized light a2′ is parallel to the polarization direction d2 of the polarizing layer 22b, so that the linearly polarized light a2′ can pass through the polarizer 22b and be emitted.

[0074] In a conventional display panel without an optical adjustment layer, a portion of the light emitted from the light-emitting region R1 has a polarization direction different from (e.g., perpendicular to) that of the polarizing layer after passing through the polarization conversion layer, and therefore cannot pass through the polarizing layer in the anti-reflection layer. In this embodiment, an optical adjustment layer is provided between the light-emitting device layer and the anti-reflection layer, and the optical adjustment layer is configured to transmit light of a first polarization state and reflect light of a second polarization state. In other words, a second portion of the light emitted from the light-emitting region R1 is reflected by the optical adjustment layer, for example, to a film layer such as a reflective electrode. This second portion of light is then further reflected by the film layer and has its polarization state converted, allowing this portion of light to also pass through the optical adjustment layer and the anti-reflection layer, thereby improving the light extraction efficiency and brightness of the light-emitting region R1. It should be understood that the polarization states and polarization directions of the light rays shown in FIG. 2B are for illustrative purposes only and are not intended to be limiting.

[0075] The principle described above with reference to FIG. 2B , in which the optical adjustment layer partially transmits and partially reflects light from light-emitting region R1 by selecting its polarization state, is merely illustrative and is not intended to limit the present disclosure. In other embodiments, the optical adjustment layer may also be another type of partially transmissive and partially reflective film (e.g., a transflective film) for light from light-emitting region R1.

[0076] On the other hand, in some embodiments, an optical microcavity is formed between the optical adjustment layer 20 and the reflective electrode and other film layers of the light-emitting device layer. After being reflected by the optical adjustment layer 20, part of the light emitted by the light-emitting region R1 may undergo multiple reflections (or optical oscillations) in the optical microcavity before passing through the optical adjustment layer and the anti-reflection layer. Such optical oscillations can also enhance the intensity of this part of the light, thereby increasing the overall brightness of the light-emitting region.

[0077] In some embodiments, the optical adjustment layer 20 is further configured to ensure that the color deviation CIEx or CIEy of the light emitted from the light-emitting region of the light-emitting device layer after passing through the optical adjustment layer 20 is less than or equal to 0.005. For example, the light-emitting regions R1, R2, and R3 may be the light-emitting regions of a blue sub-pixel, a green sub-pixel, and a red sub-pixel, respectively. The optical adjustment layer is configured to ensure that the color deviation CIEx or CIEy of the light emitted from the light-emitting region R1 (i.e., blue light) after passing through the optical adjustment layer is less than or equal to 0.001; the color deviation CIEx or CIEy of the light emitted from the light-emitting region R2 (e.g., green light) after passing through the optical adjustment layer 20 is less than or equal to 0.002; and the color deviation CIEx or CIEy of the light emitted from the light-emitting region R3 after passing through the optical adjustment layer 20 is less than or equal to 0.003.

[0078] By configuring the optical adjustment layer 20 so that the color deviation of light emitted from each light-emitting area after passing through the layer is within the above-mentioned range, the light extraction efficiency and luminance of the light-emitting area R1 can be enhanced while minimizing the color deviation of the light emitted from each light-emitting area after passing through the optical adjustment layer, thereby improving the display quality of the display panel.

[0079] Referring back to FIG. 1 , in some embodiments, the display panel 50 further includes a spacer layer 12 and a light shielding layer 16. The spacer layer 12 defines a plurality of sub-pixel openings 12a, 12b, and 12c, and the plurality of light-emitting regions R1, R2, and R3 are respectively located within regions corresponding to the sub-pixel openings 12a, 12b, and 12c, for example, within the sub-pixel openings 12a, 12b, and 12c. The spacer layer 12 may also be referred to as a pixel defining layer (PDL). The light shielding layer 16 is located between the spacer layer 12 and the optical adjustment layer 20 in a direction perpendicular to the main surface of the base substrate 10. The light shielding layer 20 defines a plurality of light-transmitting openings 16a, 16b, and 16c, and the plurality of light-transmitting openings 16a-16c may correspond one-to-one with the plurality of sub-pixel openings 12a-12c. For example, light-transmitting opening 16a corresponds to sub-pixel opening 12a and corresponds to light-emitting region R1; light-transmitting opening 16b corresponds to sub-pixel opening 12b and corresponds to light-emitting region R2; and light-transmitting opening 16c corresponds to sub-pixel opening 12c and corresponds to light-emitting region R3. The orthographic projection of the light-shielding layer 20 on the base substrate 10 overlaps with the orthographic projection of the spacer layer 12 on the base substrate 10. For example, the orthographic projection of the light-shielding layer 20 on the base substrate 10 may be within the orthographic projection of the spacer layer 12 on the base substrate 10. The light-shielding layer 16 can be configured to block ambient light, preventing it from entering the display panel. Meanwhile, light emitted from the light-emitting regions R1-R3 of the sub-pixels can be emitted through the light-transmitting openings 16a-16b.

[0080] In some embodiments, the spacer layer 12 may include a light-absorbing material, and its optical density (OD) may be greater than or equal to 0.5 / μm, but the present disclosure is not limited to this. The light-shielding layer 16 may include a light-absorbing material, and its optical density may be greater than or equal to 0.5 / μm. For example, the light-shielding layer 16 may include a black matrix (BM) material. In some embodiments, when the light-shielding layer 16 is provided, the spacer layer 12 may include a light-absorbing material or may not include a light-absorbing material; in an embodiment in which both the light-shielding layer 16 and the spacer layer 12 include light-absorbing materials, the light-shielding layer 16 and the spacer layer 12 may include the same material, but may include different materials, and the present disclosure is not limited to this.

[0081] In some embodiments, the sub-pixel openings and light-transmitting openings corresponding to each other may have different sizes (for example, width, area, etc.). For example, the size of the light-transmitting opening is larger than the size of the corresponding sub-pixel opening, and the orthographic projection of each sub-pixel opening on the base substrate 10 may be located within the orthographic projection range of the corresponding light-transmitting opening on the base substrate 10, so that the light emitted from the light-emitting area in the sub-pixel opening can effectively pass through the light-transmitting opening and will not be blocked, thereby ensuring that each sub-pixel has good light extraction efficiency.

[0082] Taking the sub-pixel opening 12a and the light-transmitting opening 16a corresponding to the light-emitting region R1 as an example, the width w1 of the sub-pixel opening 12a is smaller than the width w2 of the light-transmitting opening 16a. Here, the widths w1 and w2 are the bottom widths of the sub-pixel opening 12a and the light-transmitting opening 16a, respectively, that is, the widths on the side away from the light-emitting side of the display panel. In some embodiments, the edge portion of the spacer layer 12 defining the sub-pixel opening has a slope angle α, and the slope angle α is not higher than 35°, that is, α≤35°; in this way, each sub-pixel opening can have an inverted trapezoidal or similar shape, and the width of the sub-pixel opening gradually increases as it approaches the light-emitting surface of the display panel in the light-emitting direction of the display panel; taking the display panel 50 as a top-emitting structure as an example, as shown in FIG1 , the width of the sub-pixel opening 12a gradually increases along the light-emitting direction of the display panel 50 (that is, the upward direction in the figure). In other words, the top width of the sub-pixel opening 12a is greater than its bottom width. In some embodiments, by setting the spacer layer 12 to have a slope angle within this range, the sub-pixel opening size gradually increases along the light output direction, so that the light emitted from the light-emitting area of ​​each sub-pixel can be effectively emitted through the sub-pixel opening, thereby improving the light output efficiency of the sub-pixel.

[0083] In some embodiments, the edge portions of the light-shielding layer 16 defining the light-transmitting openings have a slope angle β, and the slope angle β of the light-shielding layer 16 is no less than the slope angle α of the spacer layer 12, i.e., β ≥ α ≥ 35°. In some embodiments, the slope angle β of the light-shielding layer 16 can be less than 90°, so that each light-transmitting opening has an inverted trapezoidal or similar shape. In other words, the width of the light-transmitting opening gradually increases as it approaches the light-emitting surface of the display panel in the light-emitting direction of the display panel. Taking the top-emitting display panel 50 as an example, as shown in FIG1 , the width of the light-transmitting opening 16a gradually increases along the light-emitting direction of the display panel 50. In other words, the top width of the light-transmitting opening 16a is greater than its bottom width. In other embodiments, the slope angle β of the light-shielding layer 16 can also be approximately 90°, i.e., the sidewalls of the light-shielding layer 16 can extend in a direction approximately perpendicular to the main surface of the base substrate 10. In this way, the light-transmitting opening 16a can have a substantially uniform width, i.e., the top width of the light-transmitting opening 16a can be approximately equal to its bottom width. In some embodiments, the difference between the top width and the bottom width of the light-transmitting opening 16a is smaller than the difference between the top width and the bottom width of the corresponding sub-pixel opening 12a. In some other embodiments, the slope angle of the light-shielding layer 16 may also be slightly greater than 90°, and the present disclosure is not limited to this. It should be understood that the above description is based on the sub-pixel opening 12a and the light-transmitting opening 16a, and the other corresponding sub-pixel openings 12b, 12c and the light-transmitting openings 16b, 16c also have similar positional relationships, which will not be repeated here. The slope angles of the edge portions of the different sub-pixel openings defined in the spacer layer may be the same or different, and the shapes, sizes, etc. of the different sub-pixel openings may be the same or different; the slope angles of the edge portions of the different light-transmitting openings defined in the light-shielding layer may be the same or different, and the shapes, sizes, etc. of the different light-transmitting openings may be the same or different.

[0084] In some embodiments, by setting the slope angle β of the light shielding layer 16 to be no less than the slope angle α of the spacer layer 12 , the light shielding layer 16 can effectively block ambient light, thereby reducing the reflectivity of the display panel and improving the display contrast.

[0085] In some embodiments, the spacer layer 12 includes edge portions (or may be referred to as spacer edges) ae1, ae2, and ae3 that define the sub-pixel openings 12a, 12b, and 12c, respectively; the light shielding layer 16 includes edge portions (or may be referred to as light shielding edges) be1, be2, and be3 that define the light-transmitting openings 16a, 16b, and 16c, respectively. In some embodiments, the edge portions ae1, ae2, and ae3 of the spacer layer 12 may be referred to as the first spacer edge, the second spacer edge, and the third spacer edge, respectively; the edge portions be1, be2, and be3 of the light shielding layer 16 may be referred to as the first light shielding edge, the second light shielding edge, and the third light shielding edge, respectively. From a plan view, the edge portions defining each opening of the spacer layer 12 and the light shielding layer 16 may be annular, with each opening surrounded by a corresponding edge portion. In this context, the annular shape is not limited to a circular shape and may include annular shapes of any shape (e.g., rectangular, pentagonal, hexagonal, etc.). It should be understood that the sub-pixel openings 12b, 12c corresponding to the light-emitting areas R2 and R3 and the corresponding edge portions ae2, ae3 of the spacer layer 12, as well as the light-transmitting openings 16b, 16c and the corresponding edge portions be2, be3 of the light-shielding layer 16 are only partially shown in Figure 1, and their relative positional relationship is similar to the positional relationship of the corresponding components corresponding to the light-emitting area R1.

[0086] In some embodiments, the spacing edges and light-shielding edges corresponding to the same light-emitting region are offset from each other in a direction parallel to the main surface of the substrate 10, with the light-shielding edges offset away from the light-emitting region, thereby making the corresponding light-transmitting openings larger than the sub-pixel openings. For example, the spacing edges ae1 and light-shielding edges be1 corresponding to light-emitting region R1 are offset by a distance x1 in a direction parallel to the main surface of the substrate 10; the spacing edges ae2 and light-shielding edges be2 corresponding to light-emitting region R2 are offset by a distance x2 in a direction parallel to the main surface of the substrate 10; and the spacing edges ae3 and light-shielding edges be3 corresponding to light-emitting region R3 are offset by a distance x3 in a direction parallel to the main surface of the substrate 10. In some embodiments, the offset distances x1, x2, and x3 are no greater than 4 micrometers (μm), that is, x1, x2, and x3 ≤ 4 μm. Setting the offset distances within this range ensures that the light-shielding layer has sufficient area, effectively blocking ambient light while fully transmitting light from the light-emitting region, resulting in a low reflectivity and good display contrast of the display panel. The offset distances x1, x2, and x3 can be the same or different. For example, the offset distance x1 corresponding to light-emitting region R1 (e.g., the light-emitting region of the blue sub-pixel) can be greater than the offset distances x2 and x3 corresponding to light-emitting regions R2 and R3 (e.g., the light-emitting regions of the green and red sub-pixels). In some embodiments, setting the offset distance x1 to be greater than the offset distances x2 and x3 can reduce color deviation of the display panel at different viewing angles. This will be described in detail later in conjunction with embodiments.

[0087] Continuing with reference to FIG1 , in some embodiments, the display panel 50 further includes an encapsulation layer 15 and a planarization layer 17. The encapsulation layer 15 is disposed between the light-emitting device layer LE and the light-shielding layer 16, for example, on the side of the light-emitting device layer LE away from the base substrate 10, but the present disclosure is not limited thereto. The encapsulation layer 15 may be a single-layer structure or a multi-layer structure; in some embodiments, the encapsulation layer 15 is a multi-layer structure, for example, it may include at least a 3-layer structure, and the refractive index of at least two of the layers is above 1.65, thereby improving the light extraction efficiency of the light-emitting area. In some embodiments, the encapsulation layer 15 may include an organic material, an inorganic material, or a combination thereof. For example, the encapsulation layer 15 may include at least one inorganic structure layer and one organic structure layer, and the coverage area of ​​the organic structure layer is no larger than that of the inorganic structure layer. For example, the orthographic projection of the organic structure layer on the base substrate 10 is located within the orthographic projection of the inorganic structure layer on the base substrate 10; setting the coverage area of ​​the inorganic structure layer to be larger than the organic structure layer can help prevent water vapor and the like from entering the light-emitting device layer LE of the display panel, thereby helping to protect multiple sub-pixels and ensure the device performance and reliability of the display panel.

[0088] In some embodiments, the planarization layer 17 is disposed between the encapsulation layer 15 and the optical adjustment layer 20, and covers the sidewalls of the light-shielding layer 16 and its surface away from the encapsulation layer 15. In other words, the light-shielding layer 16 is embedded in the planarization layer 17. In some embodiments, the provision of the planarization layer 17 can provide a flat surface for the overlying optical adjustment layer 20. That is, the optical adjustment layer is formed on a flat surface, thereby improving the uniformity of the film thickness of the optical adjustment layer 20, so that the optical adjustment layer 20 has a substantially uniform thickness and a flat surface, thereby having good optical properties. This can further improve the light extraction efficiency and brightness of the light-emitting region R1 while substantially not affecting the light emission of other light-emitting regions.

[0089] FIG3 is a schematic cross-sectional view illustrating a more detailed structure of a display panel according to some embodiments of the present disclosure.

[0090] Referring to Figure 3 , in some embodiments, the display panel 50 may further include a light-absorbing layer 23. For example, the light-absorbing layer 23 may be disposed on a side of the anti-reflection layer 22 away from the optical adjustment layer 20. For example, the polarization conversion layer 22a, the polarizing layer 22b, and the light-absorbing layer 23 are sequentially arranged in the light-emitting direction of the optical adjustment layer 20. In some embodiments, the light-absorbing layer 23 is configured to absorb ambient light, such as ultraviolet light, thereby reducing the reflectivity of the display panel and improving the panel contrast. For example, the absorption wavelength of the light-absorbing layer 23 may be set below 450 nm or below 430 nm. The light-absorbing layer 23 substantially does not absorb light emitted by the light-emitting regions R1-R3. It should be understood that the position of the light-absorbing layer 23 shown in Figure 3 is for illustration only and is not intended to limit the present disclosure. The light-absorbing layer 23 may be disposed at any suitable location in the light-emitting direction of the light-emitting device layer LE, as long as the light-absorbing layer 23 effectively absorbs ambient light and reduces the reflectivity of the display panel. For example, in other embodiments, the light absorption layer 23 may be located between the encapsulation layer 15 and the optical adjustment layer 20; or, the light absorption layer 23 may also be located between the encapsulation layer 15 and the light emitting device layer LE.

[0091] In some embodiments, a bonding layer may be provided on at least one of the opposing sides of the optical adjustment layer 20 in a direction perpendicular to the main surface of the base substrate 10. This bonding layer serves to bond the optical adjustment layer 20 to adjacent layers and may comprise, for example, an adhesive. For example, a bonding layer BL1 may be provided between the optical adjustment layer 20 and the encapsulation layer 17, with the optical adjustment layer 20 and the encapsulation layer 17 being bonded (e.g., bonded) to each other via the bonding layer BL1. A bonding layer BL2 may be provided between the optical adjustment layer 20 and the anti-reflection layer 22, with the optical adjustment layer 20 and the anti-reflection layer 22 being bonded (e.g., bonded) to each other via the bonding layer BL2. It should be understood that the bonding method for the optical adjustment layer 20 to the encapsulation layer 17 and the anti-reflection layer 22 is not limited to this, and any suitable bonding process may be used. For example, the bonding layer BL2 may be omitted, and the optical adjustment layer 20 and the anti-reflection layer 22 may be directly pressed together.

[0092] FIG4 is a plan view schematically illustrating an arrangement of sub-pixels in a pixel unit of a display panel according to some embodiments of the present disclosure.

[0093] Referring to Figure 4, in some embodiments, the display panel includes a plurality of pixel units arranged in an array, and each pixel unit may include a plurality of sub-pixels, such as a red sub-pixel, a green sub-pixel, and a blue sub-pixel. Figure 4 schematically illustrates a plurality of sub-pixels in a pixel unit. Referring to Figures 1 and 4, in some embodiments, a plurality of light-emitting regions in the light-emitting device layer LE correspond to a plurality of sub-pixels, respectively; for example, the display panel includes a sub-pixel SP1, a sub-pixel SP2, and a sub-pixel SP3, and the light-emitting regions R1, R2, and R3 in the light-emitting device layer LE are the light-emitting regions of the sub-pixels SP1, SP2, and SP3, respectively. For example, the sub-pixels SP1, SP2, and SP3 are a blue sub-pixel, a green sub-pixel, and a red sub-pixel, respectively. It should be understood that the pixel arrangement shown in Figure 4 and the shape and size of each sub-pixel are merely illustrative, and the present disclosure is not limited thereto.

[0094] In some embodiments, the aperture ratio of the blue sub-pixel is greater than or equal to the aperture ratio of the red sub-pixel, and the aperture ratio of the green sub-pixel is greater than or equal to the aperture ratio of the red sub-pixel; for example, the aperture ratio of the red sub-pixel is less than or equal to 8%, and the maximum aperture ratio of the blue sub-pixel and the green sub-pixel is less than or equal to 10%.

[0095] To better understand the effects of the optical adjustment layer and the anti-reflection layer on the light emitted from each light-emitting region, the present disclosure is further described below with reference to the following embodiments and comparative examples. However, it should be understood that the following examples are merely illustrative and the present disclosure is not limited thereto.

[0096] For example, each embodiment adopts the pixel structure shown in Figure 4 and the display panel structure shown in Figure 1, and the light-emitting areas R1, R2, and R3 are respectively the light-emitting areas of the blue sub-pixel SP1, the green sub-pixel SP2, and the red sub-pixel SP3, that is, the light-emitting areas R1, R2, and R3 are respectively configured to emit blue light, green light, and red light; the light-emitting characteristics of various embodiments 1-5 in which an optical adjustment layer and a flat layer are provided in the display panel and the comparison example 1-2 in which the optical adjustment layer and the flat layer are not provided in the display panel are compared; in the comparison example 1-2, the optical adjustment layer is not provided, and the flat layer is omitted, and the anti-reflection layer is formed on the side of the encapsulation layer 15 away from the light-emitting device layer LE and covers the light-shielding layer 16.

[0097] The relevant structural features of the display panels and the optical features of the optical adjustment layers of the embodiments and comparative examples are shown in Table 1 below:

[0098] Table 1:

[0099] In the above-mentioned embodiments 1, 2, 4, and 5, the transmittance and reflectance of the optical adjustment layer 20 for each wavelength band are shown in Figures 5A and 5B. Referring to Figures 5A and 5B, the transmittance of the optical adjustment layer 20 for light in the wavelength range of approximately 440 nm to 500 nm (i.e., the blue light band) is lower than the transmittance for light in other wavelength ranges (e.g., the green light band of approximately 500 nm to 580 nm and the red light band of approximately 580 nm to 650 nm). For example, the transmittance of the optical adjustment layer 20 for light in the blue light band is approximately 50%, for example, approximately 47% to 52%, and the transmittance of the optical adjustment layer 20 for at least part of the green light band and the red light band is greater than 80%. Furthermore, the reflectivity of the optical adjustment layer 20 for light in the blue wavelength range is greater than its reflectivity for light in other wavelength ranges (e.g., the green and red wavelengths). For example, the reflectivity of the optical adjustment layer 20 for light in the blue wavelength range is between approximately 30% and 57%, and the reflectivity of the optical adjustment layer 20 for at least a portion of the green and red wavelengths is less than 20% or less than 15%.

[0100] The display panels of the various embodiments and comparative examples were tested and compared for characteristics such as luminance of each luminous area, sub-pixel lifespan, and device power consumption. The test results for Comparative Example 1, Example 1, Example 2, and Example 5 are shown in Table 2 below, and the relevant test structures for Comparative Example 1, Example 1, Comparative Example 2, and Example 4 are shown in Table 3 below:

[0101] Table 2:

[0102] Table 3:

[0103] In Tables 2 and 3 above, R, G, and B represent the red (R), green (G), and blue (B) subpixels of the display panel, respectively. L (%) represents the luminance of the corresponding subpixel, and CIE (x, y) represents the color coordinate value of the light emitted by the corresponding subpixel. It should be understood that the luminance in Tables 2 and 3 refers to the brightness of the light emitted from the light-emitting area of ​​each subpixel after passing through the various material layers on the light-emitting side of the light-emitting area and then emitting from the light-emitting surface of the display panel. In this example, the luminous areas R1, R2, and R3 in Figure 1 correspond to the luminous areas of the blue, green, and red subpixels, respectively.

[0104] Referring to Tables 1 to 3 above, Example 1 and Comparative Example 1 share the same parameters, differing only in the inclusion of an optical adjustment layer and a planarization layer in Example 1. The optical characteristics of the optical adjustment layer are shown in Figures 5A and 5B . Comparing the test structures of Example 1 and Comparative Example 1, it can be seen that, compared with Comparative Example 1, the inclusion of the optical adjustment layer in Example 1 increases blue light brightness by 27%, while red and green light brightness remain essentially unchanged. For example, the red and green light brightnesses increase by less than 5%. Furthermore, the color coordinates of light emitted by each subpixel of the display panel (e.g., blue light emitted by the blue (B) luminescent region R1, green light emitted by the green (G) luminescent region, and red light emitted by the red (R) luminescent region) remain essentially unchanged after passing through the optical adjustment layer. For example, the color deviation values ​​CIEx or CIEy of light from each luminescent region after passing through the optical adjustment layer are all below 0.005. Furthermore, the overall device power consumption of the display panel decreases by 10.4%. Therefore, by providing an optical adjustment layer, the brightness of blue light can be significantly increased, while having little or no effect on light in other wavelengths (e.g., green and red). Furthermore, the optical adjustment layer generally does not cause color shift in light of other wavelengths, or has minimal effect. In other words, the optical adjustment layer can increase the brightness of blue light without causing color shift and has little effect on light in other wavelengths. This increased blue light brightness can also reduce overall device power consumption in the display panel.

[0105] In addition, in Examples 2, 4, and 5, the same effects as those described for Example 1 are achieved due to the provision of the optical adjustment layer.

[0106] Comparing Example 1 and Example 2, compared with Example 1, Example 2 sets the offset distances x1, x2, and x3 of the spacing edges and the light-shielding edges corresponding to each light-emitting area to be relatively smaller. Figure 6 shows the display panel reflectivity curve RC1 corresponding to Example 1 and the display panel reflectivity curve RC2 corresponding to Example 2. According to Figure 6, within a certain range, as the offset distances x1, x2, and x3 decrease, the reflectivity of the display panel decreases. This is because Example 2 sets the offset distances x1, x2, and x3 of the corresponding spacing edges and the light-shielding edges to be relatively smaller, that is, the light-shielding area of ​​the light-shielding layer 16 is relatively larger, which can block more light, thereby reducing the reflectivity of the display panel and improving the display contrast.

[0107] Comparing Example 1, Example 4, and Comparative Example 1 and Comparative Example 2, the sub-pixel aperture ratios of Example 1 and Comparative Example 1 are the same, and the sub-pixel aperture ratios of Example 4 and Comparative Example 2 are the same, and the blue sub-pixel aperture ratios of Example 4 and Comparative Example 2 are set relatively small, resulting in a relatively small luminous area of ​​a single blue sub-pixel. Combining Tables 1 and 3, it can be seen that, in the absence of an optical adjustment layer, the lifespan of the blue sub-pixel decreases dramatically when the optical adjustment layer is not provided. This is because the aperture ratio of the blue sub-pixel is reduced, and the area of ​​the blue light emitting region (e.g., the area of ​​luminous region R1) is reduced. When the power supply voltage (e.g., VDD-VSS) of the sub-pixel driving circuit remains unchanged, the current density of the blue sub-pixel is increased. At high current density, the luminous brightness of the blue sub-pixel is significantly improved. That is, when the blue sub-pixel aperture ratio is reduced, the increased current density of the blue sub-pixel increases the luminous brightness of the blue sub-pixel. However, the increased current density also accelerates the decay of the blue sub-pixel lifetime, thereby reducing the lifespan of the blue sub-pixel. Combining Examples 1 and 4, it can be seen that after providing the optical adjustment layer, since the optical adjustment layer can enhance blue light brightness, the current density of the blue sub-pixel in Example 4 can be adjusted to be approximately the same as the current density of the blue sub-pixel in Example 1, thereby ensuring the lifespan of the blue sub-pixel. At the same time, the optical adjustment layer can enhance blue light brightness and reduce device power consumption. In other words, even when the aperture ratio of the blue sub-pixel is set to a small value and the light-emitting area of ​​the blue sub-pixel is relatively small, the provision of the optical adjustment layer can enhance device brightness and reduce panel power consumption while ensuring device lifespan. Therefore, when the optical adjustment layer is provided, the aperture ratio of the blue sub-pixel can be set to a relatively small value, reducing the sub-pixel area, thereby allowing more sub-pixels to be arranged per unit area, thereby increasing the pixel density (PPI) of the display panel.

[0108] Figures 7A to 7C illustrate the luminance variation curve (L-Decay curve) LD1 of the blue light-emitting region (e.g., corresponding to light-emitting region R1) at different viewing angles, and the luminance variation curve LD2 of the red light-emitting region (e.g., corresponding to light-emitting region R3) at different viewing angles in Examples 1, 2, and 5. It should be understood that the luminance of each light-emitting region shown in Figures 7A to 7C refers to the luminance of light emitted by light-emitting regions R1-R3 after passing through the optical adjustment layer and the anti-reflection layer and exiting the light-emitting surface of the display panel.

[0109] In some embodiments, the first outgoing light and the second outgoing light emitted from the first light-emitting area (for example, the blue light-emitting area R1) and the second light-emitting area (for example, the green light-emitting area R2 or the red light-emitting area R3) and after passing through the optical adjustment layer and the anti-reflection layer have a first brightness attenuation value and a second brightness attenuation value at a viewing angle different from 0 degrees, respectively. The first brightness attenuation value and the second brightness attenuation value are respectively the percentage of the difference between the brightness of the first outgoing light and the second outgoing light at a viewing angle different from 0 degrees and the initial brightness at a viewing angle of 0 degrees as a percentage of the initial brightness; at the same viewing angle, the first brightness attenuation value is greater than the second brightness attenuation value.

[0110] For example, at a 30-degree viewing angle, the first brightness attenuation value ranges from 32% to 40%, and the second brightness attenuation value ranges from 17% to 28%. At a 45-degree viewing angle, the first brightness attenuation value ranges from 62% to 70%, and the second brightness attenuation value ranges from 55% to 57.5%. In some embodiments, at the same viewing angle, the difference between the first brightness attenuation value and the second brightness attenuation value is less than 7.5%.

[0111] For example, referring to Tables 1 and 2 and Figures 7A to 7C, in Examples 1, 2, and 5, the offset distances x1, x2, and x3 between the light-shielding edges and the spacing edges corresponding to the respective light-emitting regions are different. In Example 1, the offset distances x1, x2, and x3 between the corresponding edges corresponding to the respective light-emitting regions R1-R3 are all 4 μm. In Example 2, the offset distances x1, x2, and x3 between the corresponding edges corresponding to the respective light-emitting regions R1-R3 are smaller, all 2 μm. In Example 5, the offset distance x1 between the corresponding edges corresponding to light-emitting region R1 (e.g., the blue light-emitting region) is set to be different from (e.g., greater than) the offset distances x2 and x3 between the corresponding edges corresponding to the other light-emitting regions R2 / R3 (e.g., the green light-emitting region or the red light-emitting region); for example, x1 is 4 μm, while x2 and x3 are 1.5 μm. In some embodiments, the red and green light-emitting regions have similar degrees of brightness attenuation across viewing angles, and the following uses the red light-emitting region as an example for comparison with the blue light-emitting region.

[0112] As shown in Figures 7A to 7C, in various embodiments, the blue light-emitting region exhibits a greater luminance decay over viewing angles than the red light-emitting region; that is, at viewing angles other than 0 degrees, the luminance decay of the blue light-emitting region is greater than that of the red light-emitting region. The luminance decay degree is the degree to which the luminance at that viewing angle decreases compared to the initial luminance at 0 degrees. In some embodiments, because the optical adjustment layer generally enhances the luminance of the blue light-emitting region and has substantially no effect on the luminance of the red and green light-emitting regions, the luminance decay of the blue light-emitting region is significantly greater than that of other light-emitting regions (e.g., the red and green light-emitting regions). That is, at the same non-zero viewing angle, the luminance decay of the blue light-emitting region is greater than that of other light-emitting regions (e.g., the red and green light-emitting regions).

[0113] Comparing Example 1 and Example 2, compared to Example 1, in Example 2, as the offset distances x1, x2, and x3 between the light-shielding edges and the spacing edges corresponding to each light-emitting area decrease, the brightness attenuation of the light-emitting areas corresponding to the blue light-emitting area, the red light-emitting area, and the like further increases. This is because the offset distance between the light-shielding edge and the spacing edge decreases, which means that the area of ​​the light-shielding layer is relatively increased, and the light-transmitting opening size of the light-shielding layer is reduced, thereby further increasing the viewing angle brightness attenuation of each light-emitting area. In other words, for each light-emitting area, the offset distance between its corresponding light-shielding edge and the spacing edge is negatively correlated with the viewing angle brightness attenuation of the light-emitting area; for example, the larger the offset distance between the corresponding light-shielding edge and the spacing edge, the smaller the brightness attenuation of the light-emitting area at a non-zero viewing angle, and the smaller the offset distance between the corresponding light-shielding edge and the spacing edge, the greater the brightness attenuation of the light-emitting area at a non-zero viewing angle.

[0114] In addition, as shown in Figures 7A and 7B, the difference between the brightness attenuation curve LD2 of the red light-emitting area shown in Figure 7B and the brightness attenuation curve LD2 of the red light-emitting area shown in Figure 7A is greater than the difference between the brightness attenuation curve LD1 of the blue light-emitting area shown in Figure 7B and the brightness attenuation curve LD1 of the blue light-emitting area shown in Figure 7A; in other words, when the offset distance between the light-shielding edge and the spacing edge is reduced to the same extent, the brightness attenuation of the red light-emitting area due to the reduction of the offset distance x3 between the light-shielding edge and the spacing edge is greater than the brightness attenuation of the blue light-emitting area due to the reduction of the offset distance x1 between the light-shielding edge and the spacing edge. In some embodiments, this is because the luminous brightness of other light-emitting areas (for example, red or green light-emitting areas) is relatively high compared to the blue light-emitting area, and therefore is more affected by the above-mentioned offset distance (i.e., the size of the light-transmitting opening of the light-shielding layer). In other words, the effect of the change in the offset distance between the light-shielding edge and the spacing edge on the viewing angle brightness attenuation of the blue light-emitting area is less than the effect on the viewing angle brightness attenuation of other light-emitting areas (for example, red or green light-emitting areas).

[0115] Compared with Example 1, in Example 2, the difference between the brightness attenuation curves LD1 and LD2 of the blue light-emitting area and the red light-emitting area is smaller, thereby reducing the color deviation under different viewing angles.

[0116] In Example 5, the offset distances x1, x2, and x3 of the corresponding light-emitting areas are set to 4 μm, 1.5 μm, and 1.5 μm, respectively. As shown in FIG7C , compared to FIG7A and FIG7B , the viewing angle brightness decay curve LD1 of the blue light-emitting area in FIG7C is closer to the viewing angle brightness decay curve LD2 of the red light-emitting area, i.e., the difference between the two is smaller. This is because the larger offset distance x1 of the blue light-emitting area relatively reduces (e.g., minimizes) the viewing angle brightness decay of the light-emitting area caused by the offset distance, while the smaller offset distance x3 of the red light-emitting area relatively increases the viewing angle brightness decay of the light-emitting area caused by the offset distance. In other words, the viewing angle brightness decay factor of the offset distance is reduced for the blue light-emitting area, while it is increased for the red light-emitting area. Because the viewing angle brightness decay of the blue light-emitting area itself is greater than that of the red light-emitting area, the above-mentioned offset distance settings for each light-emitting area reduce the difference between the viewing angle brightness decay of the blue light-emitting area and the red light-emitting area, thereby reducing color deviation at different viewing angles.

[0117] Therefore, in Example 5, the offset distance x1 corresponding to the blue light-emitting area is set to be larger, so that the light-shielding layer can minimize the effect of the offset distance on the viewing angle brightness attenuation of the blue light-emitting area while meeting the light-shielding requirements and achieving the appropriate panel reflectivity; at the same time, the offset distance x2 / x3 of other light-emitting areas (for example, green or red light-emitting areas) is set to be relatively small, increasing the viewing angle brightness attenuation of other light-emitting areas caused by the offset distance, thereby narrowing the gap in viewing angle brightness attenuation between the blue light-emitting area and other light-emitting areas such as red and green, thereby reducing the color deviation at different viewing angles and maximizing the brightness and color matching at different viewing angles. On the other hand, by setting the size of the offset distance in partitions, the overall area of ​​the light-shielding layer can be guaranteed, thereby achieving strong absorption of external ambient light, reducing the reflectivity of the display panel, and improving the contrast and display quality of the displayed image.

[0118] In some embodiments, FIG8 illustrates a power consumption curve P and a brightness curve L of a display panel in Example 3 when the optical adjustment layer has different transmittances with respect to light-emitting region R1. It should be noted that the brightness curve L described below with reference to FIG8 reflects the luminance of the light-emitting region of the display panel corresponding to light-emitting region R1 (i.e., the brightness of light emitted from light-emitting region R1 and emitted from the light-emitting surface of the display panel after passing through the optical adjustment layer and the anti-reflection layer), and the transmittance of the optical adjustment layer described below with reference to FIG8 refers to the transmittance of the optical adjustment layer with respect to light emitted from light-emitting region R1, which is, for example, a region emitting blue light.

[0119] Referring to FIG. 8 , in some embodiments, within a certain range, for example, within a range where the transmittance of the optical adjustment layer is approximately 50% or less (e.g., approximately 55% or less), as the transmittance of the optical adjustment layer increases, the brightness of the display panel increases, and device power consumption decreases. Beyond this range, for example, within a range where the transmittance of the optical adjustment layer is approximately 50% or greater (e.g., approximately 55% or greater), as the transmittance of the optical adjustment layer increases, the brightness of the display panel decreases, and device power consumption increases. When the transmittance of the optical adjustment layer is approximately 55%, the brightness of the display panel reaches its maximum, and device power consumption is minimized. However, the present disclosure is not limited to this.

[0120] 2A and 8 , for example, after passing through the optical adjustment layer 20, some light emitted from the light-emitting region R1 at least partially passes through the anti-reflection layer 22 and is emitted. As described above, the anti-reflection layer 22 is used to prevent or reduce the situation where ambient light is incident on the display panel and then reflected by the material layer of the display panel and emitted from the light-emitting surface of the display panel, thereby reducing the reflectivity of the display panel and improving the display contrast. However, the anti-reflection layer 22 also has a certain blocking effect on the light emitted from each light-emitting region of the display panel. For example, the anti-reflection layer 22 is provided with a polarizing layer, and the transmittance of the polarizing layer for light in the 460nm to 630nm band is not less than 40%, for example, about 50%, such as about 55%. This band overlaps with the blue light, green light, and red light bands. That is, in the case of a conventional display panel without an optical adjustment layer, the light emitted from each light-emitting region cannot completely pass through the anti-reflection layer, and the transmittance is, for example, about 50% or 55%. In an embodiment of the present disclosure, an optical adjustment layer is provided between the light-emitting region and the anti-reflection layer, and the optical adjustment layer is configured to have a certain transmittance and reflectance for light (e.g., blue light) emitted by the light-emitting region R1. In some embodiments, the transmittance and reflectance of the optical adjustment layer to light are in a trade-off relationship, that is, the higher the transmittance, the lower the corresponding reflectance; and the lower the transmittance, the higher the corresponding reflectance.

[0121] In an embodiment of the present disclosure, by setting the transmittance and reflectivity of the optical adjustment layer to the light (e.g., blue light) emitted by the light-emitting region R1 within a suitable range, the loss of light A emitted by the light-emitting region R1 is minimized, thereby increasing the luminous brightness of the corresponding area and reducing the power consumption of the device.

[0122] FIG9 illustrates a schematic cross-sectional view of a display panel according to some embodiments of the present disclosure.

[0123] 9 , in some embodiments, a display panel 500 includes a substrate 100 and a plurality of pixel units arranged in an array on the substrate 100. Each pixel unit may include a plurality of sub-pixels that display different colors, such as a sub-pixel SP1, a sub-pixel SP2, and a sub-pixel SP3. For example, sub-pixels SP1, SP2, and SP3 may be a blue sub-pixel, a green sub-pixel, and a red sub-pixel configured to display blue, green, and red, respectively. In some embodiments, each sub-pixel includes a light-emitting device structure and a pixel circuit connected to each other, and the pixel circuit is configured to drive the light-emitting device structure to emit light.

[0124] In some embodiments, the light-emitting device structure of each sub-pixel includes at least a first electrode, a second electrode, and a light-emitting layer located between the first and second electrodes. The pixel circuit of each sub-pixel may include a thin-film transistor and a capacitor, and may adopt any suitable structure, for example, a 2T1C, 6T1C, 7T1C, 8T1C, 10T1C, 6T2C, 7T2C, 8T2C, 10T2C, etc. It should be understood that the pixel circuit of each sub-pixel can be configured and adjusted according to product design and needs.

[0125] For example, sub-pixel SP1 includes a light-emitting device structure LE1 and a pixel circuit pc1, sub-pixel SP2 includes a light-emitting device structure LE2 and a pixel circuit pc2, and sub-pixel SP3 includes a light-emitting device structure LE3 and a pixel circuit pc3. The light-emitting device structures LE1-LE3 are located in the light-emitting device layer LE, and the pixel circuits pc1-pc3 may be located on a side of the light-emitting device layer LE close to the base substrate 100. The figure schematically shows that each of the pixel circuits pc1, pc2, and pc3 includes a thin-film transistor T1, T2, and T3, and it should be understood that the pixel circuits pc1-pc3 may also include one or more other thin-film transistors and capacitors (not shown).

[0126] In some embodiments, thin-film transistors T1-T3 each include an active layer 101, a gate 103, a gate insulating layer, and source / drain electrodes 106 disposed on a substrate 100. In some embodiments, the active layer 101 is disposed on one side of the substrate 100, and the insulating layer 102 is disposed on the substrate 100 and covers the sidewalls of the active layer 101 and its surface facing away from the substrate 100. Portions of the insulating layer 102 are located between the active layer 101 and the gate 103, serving as gate insulating layers for each thin-film transistor T1-T3. The active layer 101 includes a source region, a drain region, and a channel region located therebetween. The source / drain electrodes 106 include source and drain electrodes connected to the source and drain regions of the active layer 101, respectively. It should be understood that FIG9 illustrates thin-film transistors T1-T3 having a top-gate structure, but the present disclosure is not limited thereto. Thin-film transistors T1-T3 may also have a bottom-gate structure or a dual-gate structure.

[0127] In some embodiments, the display panel 500 includes a spacer layer 112. The spacer layer 112 includes a plurality of sub-pixel openings 112a, 112b, and 112c for defining the light-emitting regions R1, R2, and R3 of the sub-pixels SP1, SP2, and SP3. The portions of the light-emitting device structures LE1, LE2, and LE3 corresponding to the sub-pixel openings 112a, 112b, and 112c constitute the light-emitting regions R1, R2, and R3. The portions of the light-emitting device structures corresponding to the sub-pixel openings are or include portions whose orthographic projections on the substrate 100 fall within the orthographic projections of the sub-pixel openings on the substrate. In some embodiments, the spacer layer 112 can also be referred to as a pixel defining layer (PDL).

[0128] In some embodiments, the light-emitting device layer LE includes a first electrode layer, a light-emitting layer, and a second electrode layer, wherein the light-emitting layer is located between the first electrode layer and the second electrode layer; the first electrode layer can be connected to the pixel circuit; the spacer layer 112 can be located on the side of the first electrode layer away from the base substrate 100, and expose at least part of the first electrode layer; the light-emitting layer is located on the side of the first electrode layer away from the base substrate 100 and can be arranged along the sub-pixel opening of the spacer layer 112, and can also be arranged along the surface of the spacer layer 112 away from the base substrate 100; the second electrode layer can be located on the side of the light-emitting layer away from the first electrode layer.

[0129] In some embodiments, the first electrode layer includes first electrodes E1a, E1b, and E1c spaced apart from each other. The first electrode layer may include a high-work-function material, such as a metal, a metal oxide, or a combination thereof. For example, when the display panel 500 has a top-emission structure as shown in FIG9 , the first electrode layer may be a composite structure including a metal layer and a transparent oxide layer (e.g., a metal oxide layer), such as Ag / ITO or Ag / IZO. For example, the thickness of the metal layer may range from 80 nm to 100 nm, and the thickness of the metal oxide layer may range from 5 nm to 10 nm. For example, the first electrode may be an anode, and the average reflectivity of the anode in the visible light region may be approximately 85% to 95%. The first electrode may also serve as a reflective electrode, for example, reflecting light emitted by each light-emitting region and reflected by the optical adjustment layer 120. It should be understood that the display panel with a top-emission structure shown in FIG9 is merely illustrative and the present disclosure is not limited thereto. In other embodiments, the display panel may also be a bottom emission structure, and the first electrode layer may include a transparent oxide, such as metal oxides such as ITO and IZO, and its thickness may range from 80 to 200 nm, for example.

[0130] In some embodiments, the light-emitting layer may include light-emitting layers 113a, 113b, and 113c. Each light-emitting layer may include a host material and a dopant material. The host material may be, for example, a wide bandgap material, such as a compound including at least one of carbazolyl, carboline, spirofluorene, fluorene, silicon, and phosphinoyl groups. The dopant material may be, for example, a phosphorescent material, a fluorescent material, or other light-emitting material. For example, light-emitting layer 113a may be a blue light-emitting layer and include at least a host material and a dopant material. The dopant material may include a fluorescent material, a delayed fluorescent material, or a phosphorescent material. Light-emitting layer 112b may be a green light-emitting layer and include at least a host material and a dopant material. The dopant material may include a delayed fluorescent material or a phosphorescent material. Light-emitting layer 112c may be a red light-emitting layer and include at least a host material and a dopant material. The dopant material may include a delayed fluorescent material or a phosphorescent material. In some embodiments, the thickness of each light-emitting layer 113a-113c can be the same or different. For example, the thickness of light-emitting layer 113a ranges from approximately 15 nm to 25 nm; the thickness of light-emitting layer 113b ranges from approximately 25 nm to 40 nm; and the thickness of light-emitting layer 113c ranges from approximately 25 nm to 40 nm. It should be understood that the thickness of the light-emitting layer refers to its thickness in a direction perpendicular to the main surface of the substrate.

[0131] In some embodiments, the light-emitting layers 113a-113c may be disposed along the surfaces of the corresponding sub-pixel openings 112a-112c of the spacer layer 112, covering the portions of the corresponding first electrodes E1a-E1c exposed by the sub-pixel openings and at least a portion of the sidewalls of the spacer layer 112. The light-emitting layers 113a-113b may further extend to cover a portion of the surface of the spacer layer 112 facing away from the base substrate 100 (or the top wall). In other words, the light-emitting layers 113a, 113b, and 113c each include at least a portion located within the corresponding light-emitting regions R1, R2, and R3, and may also include an extension portion located outside the corresponding light-emitting region. For example, the extension portion of each of the light-emitting layers 113a-113c may be located outside the corresponding light-emitting region and overlap the corresponding sidewalls and / or top wall of the spacer layer 112.

[0132] For example, each light-emitting layer 113a, 113b, and 113c can be formed by an evaporation process, which may include, after forming the sub-pixel opening, setting a high-precision metal mask (FMM) having a pattern opening on one side of the spacer layer, and making the pattern opening at a position corresponding to the corresponding sub-pixel opening, and the evaporated material (i.e., the light-emitting layer material) is deposited on the spacer layer through the pattern opening of the FMM to form a light-emitting layer; in some embodiments, the size of the pattern opening is larger than the size of the corresponding sub-pixel opening, which can facilitate the alignment of the pattern opening and the sub-pixel opening, and can ensure that the light-emitting layer can be effectively formed in the light-emitting area defined by the sub-pixel opening. In some embodiments, the orthographic projection area of ​​each of the light-emitting layers 113a, 113b, and 113c on the base substrate 100 may be larger than the orthographic projection area of ​​the corresponding light-emitting regions R1, R2, and R3 on the base substrate 100; the orthographic projections of the light-emitting regions R1, R2, and R3 on the base substrate 100 may be located within the orthographic projection range of the corresponding light-emitting layers 113a, 113b, and 113c on the base substrate 100.

[0133] In some embodiments, the second electrode layer E2 may comprise a metal material, such as metals such as Mg, Ag, and Al; metal alloys such as Mg / Ag; or metal oxides such as ITO, IZO, and IGZO. The second electrode layer E2 may serve as a cathode and may have semi-transmissive or transmissive properties. The second electrode layer E2 may extend continuously within each sub-pixel region and may serve as a common cathode. In some embodiments, assuming the display panel 500 is a top-emitting display panel, the second electrode layer E2 may be a semi-transparent cathode and may be formed by evaporating a 10nm to 20nm thick metal film (e.g., a Mg, Ag, or Al film). Alternatively, it may be formed using a metal alloy such as Mg:Ag, with a preferred Mg:Ag ratio ranging from 3:7 to 1:9, thereby ensuring that the metal film layer has a suitable transmittance. For example, the reference transmittance range of the metal film layer at 530nm may be 50% to 60%, thereby forming a semi-transparent cathode. In some embodiments, the second electrode layer E2 may also be a transparent cathode formed using a transparent oxide such as ITO, IZO, or IGZO. However, the present disclosure is not limited to this.

[0134] That is, when the display panel 500 has a top-emitting structure as shown in FIG9 , the optical adjustment layer 120 is disposed on the side of the light-emitting device layer LE that is away from the base substrate 100 , and the second electrode layer E2 is closer to the optical adjustment layer 120 than the first electrode layer. The second electrode layer can transmit light, such as light emitted by each light-emitting layer. The first electrode layer can act as a reflective electrode to reflect light, for example, light emitted by each light-emitting region, reflected by the optical adjustment layer, and irradiated on the first electrode layer, and can reflect this light back to the optical adjustment layer. However, the present disclosure is not limited thereto.

[0135] In other embodiments, the display panel may also be a bottom emission structure, and the first electrode layer may be closer to the optical adjustment layer than the second electrode layer E2. In this case, the first electrode layer may be configured to transmit light emitted by each light-emitting layer, and the second electrode layer may be configured to have a certain reflectivity and serve as a reflective electrode.

[0136] The light-emitting device structure LE1 may include at least a first electrode E1a, a light-emitting layer 113a and a portion of the second electrode layer E2 (for example, a portion corresponding to the sub-pixel opening 112a); the light-emitting device structure LE2 may include at least a first electrode E1b, a light-emitting layer 113b and a portion of the second electrode layer E2 (for example, a portion corresponding to the sub-pixel opening 112b); the light-emitting device structure LE3 may include at least a first electrode E1c, a light-emitting layer 113c and a portion of the second electrode layer E2 (for example, a portion corresponding to the sub-pixel opening 112c).

[0137] Continuing with reference to FIG9 , in some embodiments, the encapsulation layer 115 may include a first encapsulation layer 115a, a second encapsulation layer 115b, and a third encapsulation layer 115c. For example, the first encapsulation layer 115a and the third encapsulation layer 115c may include an inorganic material, wherein the inorganic material may be selected from at least one of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, and lithium fluoride. For example, the second encapsulation layer 115b may include an organic material, and the organic material may be selected from at least one of acrylic resin, methacrylic resin, polyisoprene, vinyl resin, epoxy resin, polyurethane resin, cellulose resin, and perylene resin.

[0138] In some embodiments, the refractive index of at least two of the first to third encapsulation layers 115a to 115c is greater than 1.65. The coverage area of ​​the second encapsulation layer 115b may be no larger than that of the first and second encapsulation layers 115a and 115c, thereby protecting the display panel from corrosion by water, oxygen, and the like. The number of layers and structure of the encapsulation layer 115 shown in FIG. 9 and the materials described above are for illustrative purposes only and are not intended to limit the present disclosure.

[0139] In some embodiments, a touch structure layer may be provided between the encapsulation layer and the planar layer of the display panel 50 or 500 to implement the touch function of the display panel. The touch structure may be any type of touch structure, such as a self-capacitive touch structure or a mutual-capacitive touch structure. For example, a self-capacitive touch structure or a mutual-capacitive touch structure may include at least one conductive layer, but the embodiments of the present disclosure do not limit the specific type and structure of the touch structure.

[0140] Figures 10A to 10C illustrate schematic cross-sectional views of portions of a display panel according to some embodiments of the present disclosure. For example, Figures 10A to 10C correspond to more specific schematic structural diagrams of regions st1, st2, and st3 of the display panel in Figure 9 in other embodiments. These regions include portions of light-emitting device structures LE1 to LE3, respectively.

[0141] As shown in Figures 10A to 10C, in some embodiments, in a direction perpendicular to the main surface of the base substrate 100, the light-emitting device structure LE1 may include, from bottom to top, a first electrode E1a, a hole injection layer HIL, a hole transport layer HTL, an exciton blocking layer EBL1, a light-emitting layer 113a, a hole blocking layer HBL, an electron transport layer ETL, an electron injection layer EIL, and a second electrode E2; the light-emitting device structure LE2 may include, from bottom to top, a first electrode E1a, a hole injection layer HIL, a hole transport layer HTL, an exciton blocking layer EBL2, a light-emitting layer 113b, a hole blocking layer HBL, an electron transport layer ETL, an electron injection layer EIL, and a second electrode E2; the light-emitting device structure LE3 may include, from bottom to top, a first electrode E1a, a hole injection layer HIL, a hole transport layer HTL, an exciton blocking layer EBL3, a light-emitting layer 113c, a hole blocking layer HBL, an electron transport layer ETL, an electron injection layer EIL, and a second electrode E2.

[0142] In some embodiments, the hole injection layer (HIL) is used to lower the hole injection barrier and improve hole injection efficiency. The HIL can be formed as a single layer using materials such as HATCN and CuPc. Alternatively, the HIL can be formed by p-doping a hole transport material. For example, the HIL can include materials such as NPB:F4TCNQ or TAPC:MnO3. In some embodiments, the HIL thickness can range from 5 nm to 20 nm, and the p-type dopant concentration can be approximately 0.5% to 10%. However, the present disclosure is not limited to this.

[0143] In some embodiments, the hole transport layer (HTL) can be formed using a carbazole-based material with high hole mobility via an evaporation process. For example, the highest occupied molecular orbital (HOMO) energy level of the material of the hole transport layer (HTL) must be between -5.2 eV and -5.6 eV. For example, the thickness of the hole transport layer (HTL) can range from approximately 100 nm to 200 nm. However, the present disclosure is not limited thereto.

[0144] In some embodiments, the exciton blocking layer can be configured to transfer holes, block electrons, and excitons generated in the corresponding light-emitting layer. For example, the light-emitting device structures LE1, LE2, and LE3 can be configured to emit blue light, green light, and red light, respectively, and the exciton blocking layers EBL1, EBL2, and EBL3 can be blue exciton blocking layers, green exciton blocking layers, and red exciton blocking layers, respectively. The thickness of each exciton blocking layer EBL1-ELB3 can be the same as or different from each other. For example, the thickness of the blue exciton blocking layer EBL1 can range from approximately 1 nm to 10 nm, the thickness of the green exciton blocking layer EBL2 can range from approximately 15 nm to 30 nm, and the thickness of the red exciton blocking layer EBL3 can range from approximately 40 nm to 60 nm. However, the present disclosure is not limited to this.

[0145] In some embodiments, the hole blocking layer HBL is configured to transfer electrons and block holes and excitons generated in the light emitting layer. For example, the thickness of the hole blocking layer HBL may range from about 2 nm to 10 nm, but the present disclosure is not limited thereto.

[0146] In some embodiments, the material of the electron transport layer (ETL) can be prepared by blending a material such as a thiophene, imidazole, or azine derivative with lithium quinoline, wherein the proportion of lithium quinoline can range from approximately 30% to 70%, and the thickness of the electron transport layer (ETL) can range from approximately 20 nm to 40 nm.

[0147] In some embodiments, the electron injection layer (EIL) may be made of LiF, LiQ, Yb, Ca, etc. and may be formed by, for example, an evaporation process. The thickness of the electron injection layer (EIL) may be in a range of about 0.5 nm to 2 nm.

[0148] 9 and 10A to 10C , in some embodiments, the display panel 500 further includes a light extraction layer CPL, which is disposed on the light-extracting side of the light-emitting device layer and may be disposed between the light-emitting device layer LE and the encapsulation layer 115. For example, the light extraction layer CPL may be disposed between the second electrode layer (e.g., cathode) E2 of the light-emitting device layer LE and the encapsulation layer 115. In some embodiments, the difference between the refractive index of the light extraction layer CPL and the refractive index of the material layer (e.g., the first encapsulation layer 115a) in the encapsulation layer 115 that is adjacent to (i.e., in contact with) the light extraction layer CPL is greater than 0.1. Providing the light extraction layer CPL can improve the light extraction efficiency of the light-emitting device layer.

[0149] In some embodiments, the present disclosure provides a display device comprising the display panel described in any of the above embodiments.

[0150] In the embodiment of the present disclosure, by providing an optical adjustment layer and an anti-reflection layer, the light extraction efficiency of the blue light can be improved and the luminous brightness of the blue light area can be enhanced while ensuring the life of the blue light, thereby reducing the device power consumption of the display panel and substantially not affecting the luminescence of other areas. For example, compared with traditional OLED devices, the blue light brightness of the display panel of the embodiment of the present disclosure can be increased by more than 20%, and the device power consumption can be reduced by more than 8%. In addition, because the optical adjustment layer enhances the blue light brightness, the luminous area of ​​the blue sub-pixel can be set to be relatively small while ensuring the life of the blue light, and the overall area of ​​the blue sub-pixel can be reduced, and more sub-pixels can be set per unit area, thereby increasing the pixel density. In some embodiments, the total aperture ratio of the display panel can be reduced to more than 15%; for example, the pixel density of the display panel of the embodiment of the present disclosure can be not less than 460PPI, and for example can reach more than 520PPI.

[0151] On the other hand, the embodiment of the present disclosure provides an anti-reflection layer, a light-shielding layer, and an offset distance between the light-shielding edge and the spacing edge, so that the display panel has a lower reflectivity and a high contrast; for example, the overall reflectivity of the display panel does not exceed 7%, and the display contrast can exceed 1000000:1.

[0152] There are a few points to note:

[0153] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to conventional designs.

[0154] (2) Unless there is any conflict, the features of the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0155] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A display panel comprising a plurality of sub-pixels arranged in an array, and comprising: substrate substrate; a light-emitting device layer, disposed on one side of the base substrate, wherein the light-emitting device layer includes a plurality of light-emitting regions configured to emit different colors, the plurality of light-emitting regions respectively corresponding to the plurality of sub-pixels, and including a first light-emitting region and a second light-emitting region, the first light-emitting region being configured to emit light in a first wavelength band and having a first color, and the second light-emitting region being configured to emit light in a second wavelength band and having a second color; an optical adjustment layer, disposed on a light-emitting side of the light-emitting device layer, wherein the optical adjustment layer is configured to have a transmittance to the light in the first wavelength band lower than a transmittance to the light in the second wavelength band, and a reflectance to the light in the first wavelength band higher than a reflectance to the light in the second wavelength band, wherein the optical adjustment layer at least covers the first light-emitting area, and an orthographic projection of the first light-emitting area on the base substrate is located within an orthographic projection of the optical adjustment layer on the base substrate; as well as The anti-reflection layer is arranged on a side of the optical adjustment layer away from the light emitting device layer. 2 . The display panel according to claim 1 , wherein a wavelength of the first wavelength band is smaller than a wavelength of the second wavelength band. 3 . The display panel according to claim 1 , wherein the transmittance of the optical adjustment layer to the light in the first wavelength band is in a range of 30% to 70%, and the reflectivity of the optical adjustment layer to the light in the first wavelength band is in a range of 30% to 70%.

4. The display panel according to any one of claims 1-3, wherein the plurality of light-emitting areas further include a third light-emitting area, the third light-emitting area is configured to emit light within a third band and having a third color, the optical adjustment layer is configured to have a transmittance to the light in the third band greater than a transmittance to the light in the first band, and a reflectivity to the light in the third band less than a reflectivity to the light in the first band. 5 . The display panel according to claim 4 , wherein the optical adjustment layer has a transmittance greater than 80% and a reflectivity less than 15% for at least part of the light in the second wavelength band and the light in the third wavelength band.

6. The display panel according to claim 4, wherein the first band is 440nm to 500nm, one of the second band and the third band is 500nm to 580nm, the other of the second band and the third band is 580nm to 650nm, and the first color is blue, one of the second color and the third color is green, and the other of the second color and the third color is red.

7. The display panel according to claim 4, wherein The plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the first light-emitting area, the second light-emitting area, and the third light-emitting area are light-emitting areas of the blue sub-pixel, the green sub-pixel, and the red sub-pixel, respectively; and The aperture ratio of the blue sub-pixel is greater than or equal to the aperture ratio of the red sub-pixel, the aperture ratio of the green sub-pixel is greater than or equal to the aperture ratio of the red sub-pixel, the aperture ratio of the red sub-pixel is less than or equal to 8%, and the maximum aperture ratio of the blue sub-pixel and the green sub-pixel is less than or equal to 10%.

8. The display panel according to claim 4, wherein the optical adjustment layer is configured so that a color deviation value CIEx or CIEy between the incident light emitted from the plurality of light-emitting areas and the incident light after passing through the optical adjustment layer is less than or equal to 0.

005.

9. The display panel according to claim 8, wherein The first light-emitting area, the second light-emitting area, and the third light-emitting area are light-emitting areas of a blue sub-pixel, a green sub-pixel, and a red sub-pixel, respectively, and the optical adjustment layer is configured so that a color deviation value CIEx or CIEy of an outgoing light obtained after a first incident light emitted from the first light-emitting area passes through the optical adjustment layer relative to the first incident light is less than or equal to 0.001; A color deviation value CIEx or CIEy of an outgoing light obtained after the second incident light emitted from the second light emitting area passes through the optical adjustment layer relative to the second incident light is less than or equal to 0.002; and A color deviation value CIEx or CIEy of an output light obtained after the third incident light emitted from the third light emitting area passes through the optical adjustment layer relative to the third incident light is less than or equal to 0.

003.

10. The display panel according to claim 4, wherein the optical adjustment layer is a continuous film layer, and the orthographic projections of the second light emitting area and the third light emitting area on the base substrate are also located within the orthographic projection of the optical adjustment layer on the base substrate. 11 . The display substrate according to claim 4 , wherein the orthographic projections of the first light emitting area, the second light emitting area and the third light emitting area on the base substrate are located within the orthographic projection of the anti-reflection layer on the base substrate. 12 . The display panel according to claim 1 , wherein the optical adjustment layer is configured to transmit a first portion of light emitted from the first light emitting area and reflect a second portion of the light, and the anti-reflection layer is configured to transmit the first portion of light.

13. The display panel according to claim 12, wherein The optical adjustment layer is further configured to reflect the second portion of light to at least one film layer between the optical adjustment layer and the base substrate, and the second portion of light is further reflected by the at least one film layer and emitted to the optical adjustment layer as a first sub-light; The optical adjustment layer is configured to transmit at least a portion of the first sub-light; and The anti-reflection layer is configured to transmit the at least a portion of the first sub-light. 14 . The display panel according to claim 13 , wherein the light emitting device layer comprises a reflective electrode, and the at least one film layer reflecting the second portion of light comprises the reflective electrode. 15 . The display panel according to claim 13 , wherein the first portion of light has a first polarization state, the second portion of light has a second polarization state, and the polarization state of the second portion of light changes after being reflected by the at least one film layer, so that the first sub-light has the first polarization state.

16. The display panel according to claim 15, wherein the anti-reflection layer comprises at least a polarization conversion layer and a polarizing layer, the polarizing layer is located on a side of the polarization conversion layer away from the optical adjustment layer, and the polarization direction of the light with the first polarization state after passing through the polarization conversion layer is parallel to the polarization direction of the polarizing layer. 17 . The display panel according to claim 16 , further comprising a light absorbing layer, wherein the light absorbing layer is located on a side of the polarizing layer away from the polarization conversion layer.

18. The display panel according to any one of claims 1 to 3 and 12 to 17, wherein the orthographic projection of the optical adjustment layer on the base substrate is located within the orthographic projection range of the anti-reflection layer on the base substrate.

19. The display panel according to claim 2, further comprising: A spacer layer, defining a plurality of sub-pixel openings, wherein the plurality of light-emitting regions are respectively located in corresponding sub-pixel openings; as well as A light-shielding layer is located between the spacer layer and the optical adjustment layer in a direction perpendicular to the main surface of the base substrate, the light-shielding layer has a plurality of light-transmitting openings, the plurality of sub-pixel openings correspond to the plurality of light-transmitting openings one by one, and the orthographic projection of each sub-pixel opening on the base substrate is located within the orthographic projection range of the corresponding light-transmitting opening on the base substrate.

20. The display panel according to claim 19, wherein The spacing layer and the light shielding layer respectively have a first sub-pixel opening and a first light-transmitting opening corresponding to the first light-emitting area, and a second sub-pixel opening and a second light-transmitting opening corresponding to the second light-emitting area; The spacing layer has a first spacing edge defining the first sub-pixel opening and a second spacing edge defining the second sub-pixel opening, and the light shielding layer has a first light shielding edge defining the first light-transmitting opening and a second light shielding edge defining the second light-transmitting opening; as well as The first spacing edge and the first light shielding edge have a first offset distance in a direction parallel to the main surface of the base substrate, and the second spacing edge and the second light shielding edge have a second offset distance in a direction parallel to the main surface of the base substrate. The display panel of claim 20 , wherein the first offset distance is different from the second offset distance.

22. The display panel of claim 21, wherein the first offset distance is greater than the second offset distance. 23 . The display substrate according to claim 20 , wherein the first offset distance and the second offset distance are less than or equal to 4 micrometers.

24. The display panel according to any one of claims 20 to 23, wherein The first and second outgoing lights emitted from the first and second outgoing lights and passing through the optical adjustment layer and the anti-reflection layer respectively have a first brightness attenuation value and a second brightness attenuation value at a viewing angle different from 0 degrees, and the first brightness attenuation value and the second brightness attenuation value are respectively percentages of the difference between the brightness of the first and second outgoing lights at a viewing angle different from 0 degrees and the initial brightness at a viewing angle of 0 degrees to the initial brightness; and At the same viewing angle, the first brightness attenuation value is greater than the second brightness attenuation value.

25. The display panel according to claim 24, wherein At a viewing angle of 30 degrees, the first brightness attenuation value ranges from 32% to 40%, and the second brightness attenuation value ranges from 17% to 28%; At a viewing angle of 45 degrees, the first brightness attenuation value ranges from 62% to 70%, and the second brightness attenuation value ranges from 55% to 57.5%. 26 . The display panel according to claim 24 , wherein at the same viewing angle, a difference between the first brightness attenuation value and the second brightness attenuation value is less than 7.5%.

27. The display panel according to any one of claims 19 to 23, wherein the spacer layer comprises a light-absorbing material, the absorbance of the spacer layer is not less than 0.5 / μm, and the slope angle of the spacer layer is less than or equal to 35 degrees.

28. The display panel according to any one of claims 19 to 23, wherein the light shielding layer comprises a light absorbing material, and the absorbance of the light shielding layer is not less than 0.5 / μm.

29. The display panel of claim 28, wherein the spacer layer does not include a light absorbing material. 30 . The display panel according to claim 28 , wherein the spacer layer comprises a light absorbing material, and the light absorbing material of the spacer layer is the same as the light absorbing material of the light shielding layer.

31. The display panel according to any one of claims 19 to 23, wherein a slope angle of the light shielding layer is greater than or equal to a slope angle of the spacing layer.

32. The display panel according to claim 1, wherein the light-emitting device layer comprises a first light-emitting layer and a second light-emitting layer, the first light-emitting layer and the second light-emitting layer respectively comprise at least portions located in the first light-emitting area and the second light-emitting area, the first light-emitting layer having a thickness ranging from 15 nm to 25 nm in a direction perpendicular to the main surface of the base substrate; the second light-emitting layer having a thickness ranging from 25 nm to 40 nm in a direction perpendicular to the main surface of the base substrate.

33. The display panel according to claim 1, further comprising an encapsulation layer located on a side of the light-emitting device layer close to the optical adjustment layer, wherein the encapsulation layer is a multi-layer structure, and a refractive index of at least two layers thereof is greater than or equal to 1.

65. 34 . The display panel according to claim 33 , wherein the encapsulation layer comprises at least an inorganic structure layer and an organic structure layer, and a coverage area of ​​the inorganic structure layer is greater than or equal to a coverage area of ​​the organic structure layer.

35. The display panel according to claim 33 further comprises a light extraction layer, which is located between the light-emitting device layer and the encapsulation layer, and the refractive index difference between the light extraction layer and the material layer in the encapsulation layer that contacts the light extraction layer is greater than 0.

1.

36. A display device comprising the display panel according to any one of claims 1-35.

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